A communication network has a bandwidth of 10 kHz. Calculate the signal-to-noise ratio in dB if the capacity of the channel for a 100Kbps [2 Marks]
ii. A communications channel with a bandwidth of 4kHz has a signal power to noise ratio of 7. Determine the Channel Capacity. [2 Marks]
ii. The bandwidth in b above is reduced by 25%. How much should the signal power be increased to maintain the same channel capacity?

TASK:

Each of the following generators is going to supply a load of 10kw at a power factor of 0.8 (If AC, if DC 1) for 24hrs, each of them will run at 3000rpm. Both diesel and petrol have energy values of 45MJ/kg but the efficiency of petrol engines is 25% whilst the efficiency of diesel engines is 45%. Calculate the fuel burn rate in kg/hour and the efficiency of each. Use the burn rate to calculate the cost of fuel and add that to the daily hire rate to get a total cost of the generator for 24hrs and hence say which would be the most suited to the job.

l. what is the difference between a real independent voltage source and an ideal independent voltage source? Give an example of a real voltage source and explain how it differs from the ideal.

2. What does it mean when we say that a circuit containing multiple sources is invalid?Give an example of such a circuit and explain why it is invalid.

3. What is resistance? What is a node? What is a closed loop?

4. Write the equations for Ohm's law and for Kirchoff s two laws.

5. Explain how one can distinguish between two circuit elements which are connected inseries verses two circuit elements which are connected in parallel.

6.  If the two headlights of a car each dissipate 55W and each of them are connected to the two terminals of a 12V bafiery, draw an electric circtrit diagram which can model this headlight circuit and find the resistance of each headlight when it is turned on. Find the total current coming from the battery. If the battery is rated at 65 A-hr, how long will the headlights continue to burn before the battery is dead? Show all calculations.

Define a target type/usage environment where millimeter-wave radar, infrared (IR), hyperspectral, laser radar (LIDAR) sensors will provide performance superiority.

The surface ? = 0 separates two perfect dielectrics. For x > 0 ??1 = 3 while ??2 = 5 where ? <0. If ?? = 80?? - 60?? - 30?? ?/?, find

a) ?2

b) ?2 ? ?2

c) The angle ?1 between ?1 and the normal to the surface.

d) The angle ?1 between ?2 and the normal to the surface

A. In thermal equilibrium, how do electrons acquire the energy necessary to move from the valence band to the conduction band?

B. Write expressions for the electron concentration in the conduction band at T = 0 K and at T = 300 K. Assume the semiconductor is intrinsic silicon.

Construct a bridge-controlled rectifier with R-L loads using Matlab/Simulink software. Circuit parameters – can be either calculating, refer to any sources (textbook, journal, or technical manual) or assumption

a. Describe the circuit designed, parameters selection and output signal outcomes

b. Constant the firing angle, then discuss the effect of changing L to see the operation of CCM and DCM.

c. Constant the L, then discuss the effect of changing the firing angle to see the operation of CCM and DCM.

d. Change to use only R load and compare the outcomes with R-L loads.

e. Based on the simulation results, give one example could be used from this kind of rectifier in practical.

Calculate the resistivities of intrinsic Si, GaAs, and Ge at 300 K

An RLC circuit consists of a resistor R = 12 LaTeX: \ OmegaΩ, a capacitor C = 0.1 F and an inductor L = 2 H. A voltage source is connected that supplies 110 V. If initially the capacitor is
discharged and no current flows through the circuit, find an expression for the charge at all times t.

Describe two types of fields pertinent to electronic circuits, and explain why there are no ideal resistors, capacitors or inductors.

Attach a screenshot of Multisim circuit. circuit output equations are F1 = ∑ (1,3,5,7,9,15), F2 = ∑ (0,2,4,6,8,10,14), design the circuit on Multisim using 8x1 MUX and 16x1 MUX. The circuit with probes on output.